There were three, GG41, GG42 and GG43. Colin Taylor drove GG42 with K Foulkes, Graham Carter and Grahame Brownlie shared the driving of GG42, and Ian Pinkerton drove GG43 with me reading the notes.
I used to know where they all went when the oil crisis over the 1973/74 summer looked like ending rallying, but have forgotten...
And they were fast - if not 100% reliable
Edit: Great movie, Carlo. Have just watched it right through. Don't remember seeing it at the time, though I must have. I arranged the NZBC sponsorship for the Toyota team